What is Rule 200?

Could you please clarify what Rule 200 refers to in the context of cryptocurrency and finance? Is it a specific regulation imposed by a governing body, an internal policy within a financial institution, or perhaps a widely accepted industry guideline? Could you provide some context on where this rule originates and what it aims to achieve in terms of protecting investors, ensuring market integrity, or facilitating fair and transparent transactions? Understanding the nature and purpose of Rule 200 would help us appreciate its significance in the cryptocurrency and finance landscape.